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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c34690778cd49e8744e45e0fd4b575fddc3fdcc324d6ccab9378668afc686b4' 
  AND token = 'sSKr4b6Yn9WEgUR2lXa7/3LPpHiocKG1LCeXmxD87fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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