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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d22e28d1880d8d2943a5b69f47391b2cc521fb630be1a796a9a4ded406eeb26' 
  AND token = 'W8g1bR96pULMv6ARJZRzIyKRKW7666mGGnXy5FdF2to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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