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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d31b7474a2750fcef3aa31431f06f144dfde84b8bb650b93f36e891605d71e4' 
  AND token = 'FFnvXK6M239WaixjMzJ6ID6bIKQ5FU8eOLMHJTT7FeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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