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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82fc03bfefd89cc505f94841a5a9ae5344a618e1fad125c8f1cf021a003cc20' 
  AND token = 'u0pNoAn118u0no+97RkAaqO/fi81g/f89Y9sCOpR9UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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