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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c654037e773cc87bdd2b09c3641ca3f984d138c2c040b436c1972dcbeb02b1d4' 
  AND token = 'fipKcyld4NC5HwMNOEJz4JftWiuPpo0u9fOweHGlYyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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