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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b80e6e579b71e22aa9aa2e8cbe281aa34dab6e3f52b667ea284c9c6149ecc9' 
  AND token = 'dsKSnv5oX3aD2CCj4V9QEPM/k1QtSdjkWq+qe0xWuOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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