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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24aa2737b279437793bc6e70e08fff863e3cb006c8ba05861b9b527fee8e4065' 
  AND token = 'NmX1AKp13YF+VsudPzCw6I87HUfs/BNIP+bBzU01i14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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