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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b82ba4d98250968cc2bbf2be69ba7827c35b8a095ab1d07f0a5f15563aa12a' 
  AND token = 'qfw7MbaglNW1ZU9YTSD5yopX0Wfoik4c1PLtJxOEjMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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