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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25caf3ae0f2a7bf7e69d10e341a10aede1b4df11063956242666251e5435f95c' 
  AND token = '9+ViL4OLiPgY4ci3LXAQ6CSa0lhL/Lj3o57onRcvovg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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