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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06435a744a1a192a035e4b95adc814bbbdee411341c9f5f70a3bb82f8628931' 
  AND token = 'E0nVzKJW9Iq/DdDhlm3+CCXVgrr6/Q2bEfcg1sDWzPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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