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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08d48b50dd6960eb38dab939d1b208bde3651c5be279a5f095e1014ea64a96b' 
  AND token = 'hS0UhUPP/8U86DOLTCDFBgAhtyYbLJHdaPpx4ecqDg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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