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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca92855588efad38f410610797d4be06d87a64057f226a81eb0669e2b3cfacb' 
  AND token = 'FyKD1+yW9gmAKngrtq1rX3/KgsdgmpsID3nDcWILIP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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