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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccca23b492528d6a683f320e6e5209ca019af134db7c31813244c27a4db3012f' 
  AND token = 'gKLypPdhjs+Nv4B45B2hhTy2j23QaKHZdWTSnSc4La4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}