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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c02bd5f39964d2d7976c40ac5d4c04030df3a6f398572af3df836dd9c15d3ff' 
  AND token = 's/m9c4R7Q2Oz8YAbKaiqNqyOLyEV3IRj6P7JUtEuOxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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