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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e400ceff9dd363b80f4cf0c3e534eb6b554b9726fa4215e782f6c8cd8c010c' 
  AND token = 'WotXxJ5P0ZtRlFFueW1H9HlsHavo/7DQI5L8cKE1jHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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