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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da99e38a7347c5629028a97efce19c07292e4f5d9208c47fd47f72430ef0254' 
  AND token = 'iq/E/1Fqi/VX5T1z2NyV2lrIKPstyWHLZT39RK3FpcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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