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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c095794aed2e0d5e71869ac6f31db2097feaef6156cbc14fbffca27f7fbf656f' 
  AND token = 'PcyjYXRKd/PTqm1RH30GLEu0j24H33JYxAFi7LWzvWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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