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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82bfc6c9d3cb32e3e616989d41236083a2442c88c0195102891c32c420b462e' 
  AND token = 'JFco9s6Zq7thts14BqbfwxQjeRfuWUi1hFGCeF+YUm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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