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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90e908a95dcebe984cd1b7c6d474097658d99197053377f641ee4988a73426c' 
  AND token = 'TuMNMIpPjhcS1LU6U/IO+XadqKz/giFH7OFBA41pqZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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