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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db2513009dee89bb906aaf0abb5109f10df8ec83df8693d3534bf0a614d6d4e' 
  AND token = 'VKRT9r+OhyFKNldjNwJLOjtmmj6Gr9CNAMuKHEmepqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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