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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fcba05dea406f720951022b1c7702a5542dd7e823bf1686c12cc144e63b557' 
  AND token = 'g+OrHp80OX+bK5oJYU9gdXZoypPBoFqg29MNf4oGrdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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