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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e25e7a69b715677b6d1458354c466f8a1a88bbfffe3ce18e45eb70d8c01b7d' 
  AND token = '0yKcURVdZs4ldmXjQ8ataH2m1nuUtS1Q69eSpGUrzlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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