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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c498985791caf8c001838898bcfb0040c6189507a05b80986d12dbb6ef7df219' 
  AND token = '7HawuF2+V6BQp3t3Jb9qoGRwd6q2txq1xjIWHWpaQB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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