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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4b9b0dd4dabbf83f06f6623d143312346f23b57132407472bbcd56d7b2b6d8' 
  AND token = 'LERusEOk69advn5pUCAonvz2xLvNqeBHqy+NypsY/s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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