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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8baac5765e7be16866740eab65dad9a6026f5243dee5f49f5edf3086366b92' 
  AND token = 'vt7Q7ENxKsLMY6wEGhBKp8HQN+tLtHAdJpREKQB581s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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