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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213725016395da5f2ef7991be5381064ddf2d2e912abad2d8ce5ec34e6b3b336' 
  AND token = 'QJSQGDU1+fCJrsL059xe/sN18lIv1oiNPZJh6gwNH6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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