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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e1222a95ae744f7944675922c25834729f3db118acea2571333403c6d06053' 
  AND token = '2L5xMH4cNyO+8lEarK6LuNNzQZsi5MpKjyWSXxKo3so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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