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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b46c83e63a6489f3e1b9d37f4c0f1eb99c91e323d0f56becb86930a87dc109c' 
  AND token = 'FeVVystwyazXvwuseh0DRgWggaOvcIihAkOK262rjSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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