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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a202813bae4c2cb4e5503c01a3f5478953fd36db2527b0998ed36f696ee22dd7' 
  AND token = '7KZAra4CIqCw4HIr5duDrh/2PI6R2LL3CfInx2rdvvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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