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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76a1db63bf8f9ace2ed89ec7c8cc10c2559bb311e75d528f3200951da826043' 
  AND token = 'p1DkMU37K9YOjYQFH2yhE8WId5jwWKJ3TjY6dC0YJ8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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