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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96eee9887699f0e3656ce715ffc6706f4ddec7c1f3790dc3632d6534215f997a' 
  AND token = 'pGASmi05H4lk2J1p8lKF8znCr0vGnl46Ow6DkWColnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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