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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6f02b2b9053673ef1021c58df12df97f0dba5c9aba3d3bfd76d8f61bd9861b' 
  AND token = 'xbFceq5PKTMmhXfhv7I7Ws68XpxY6ijMz/atAamNC6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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