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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f270801d83be9a0b898a970e4c896b68bfbaf25817446fa4e2c3b61ed3d0ecd7' 
  AND token = 'Ze5J6JXdAQPNJ7CTBBBTmvLz07gxiGP+2a3JcnMB9fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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