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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1bb686d8f42f4811fbbcc976e7c0dbc8796c060ecf88c0fbb0e2a65c4201e5' 
  AND token = 'TfRPvY4OKa4kLU6BknOEjoJxR4yvxEIawUvABBf15V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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