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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d8904c7f64d42693f90594d9793fc137fc67f9b65dff3f37b3dc08ca795521' 
  AND token = 'ifmO2O2dlp2QGnveQeNSUI/BTPO2BTavALiqApgpYJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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