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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f0d712c64f41bd3fcfd5ae181f61348b22195e84e5433ce88d2998fa3ef5df' 
  AND token = '0cxImOLG1FfQe4DwZzkeT6PJMkRQF9uoOasiJWm98Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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