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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2a03a8e7d70935d8c3d5e434a92d7e139684b337992a36fe178131026eee53' 
  AND token = 'qREdS98deYU4iRTznvMPVS4iW4ot6AagyIb8pDrvP70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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