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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f4f99897a1604439e4d395a431c72725acd4580976cf6f82d1afe48fe8cd7a' 
  AND token = 'mfOnTvgdYiBcscxoQvfclEnR1qljt7sUcgYLVNvZark=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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