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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97bac546cc38fe248a5d613b47df326a7db0b0d3479fa9fb546fb8ed52d89b7' 
  AND token = 'K5NiJF75CIb7wC94xrtfp9uNXrqMguE0QUtlwbALU1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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