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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a1b94647f961ef5ef021489da31bb3466f6e2723efea84fa459d65411d9d2e' 
  AND token = 'tluhzNO+ln2vC9yPIp3yDoUJkHasSw7kRpGP31fV6s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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