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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef40eee5dc84d972d37f361d96fba9e540d986019084f0facdae13e0d840874' 
  AND token = '5xQTq09aTDWerYO+Mx5VDol1McIEyKriw1ERvRw+utU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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