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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e39f8448d2e3adb05c5cc4a6bdeeb2b3a94e6ed264707edee51d19c9f835207' 
  AND token = '5/nqeS+HQ5IqKEOJId/3waqjpPUId52hSsV0fjWoN3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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