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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbe4ac0f30224a69867edf5b7c90f6e973abdb8691294c61b2c6cae9c3d43af' 
  AND token = 'nXXA7N/XkTDa5AC8LGmN7Zf9wLCTDKdrUAk2OtTavTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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