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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ab9ea8ff3e9b82dd296656b59dbee2edf18cbb2eb487ad0e7637f5809ad5c9' 
  AND token = 'Xc0ZOQZNFS546mpipIkNvAwrKZ3DBFOAds8tI0QhtSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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