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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfec5885ec1c607a07a17d3b026d58493969758569fe0e2cb69d159725d74cd' 
  AND token = 'xczWOzjX9/vsSJh7dnFRqfJZN4rgGbFg9y1sCQnt1f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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