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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e4314499fa23700e3d70a1afcb46117be4ec07c11af88e05195e8cd9eb9207' 
  AND token = 'Vr9+afNVrKPvX1Kyc7UORip8lE/DsXu98H08GJjxnyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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