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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7256f33e947b1eb78debd4e7fbc528fa7233a9f7ec87ef5e4213dba9147938' 
  AND token = 'FUz7Uw+PLqSxsTH73Ke91MzMLJbKdDUbVIFetXnM6fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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