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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ed1783d1967f61b4508d736ef21c117e3dd52f1f8a69f59679eb06fed1a830' 
  AND token = 'MaSzOsWwCzIh8HFGisLz7w7lfy6Y4xCpIP0hlzTAjV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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