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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdcd4d062d941d2c1ef938713daded33955eae70075fca27e827b9bae61ee48' 
  AND token = '+VRZFPdBLhj60q9amwkHNkR3g2WiUyKIG+Ywk1dts+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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