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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6df2b862a02ac3a1553c667f25f297788310cc4fa5a24542dcad52f276c74d' 
  AND token = 'Y0cvlwlO67zMEK6qgP1mH4arkyr1Bh91rjqEG34nVQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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