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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9448cceddcda1709b089c3e9393d961ee96e331260bc9010b1afc2df0ef3310' 
  AND token = 'VzKC2MJfzdrY2WE4VM/YCXSbzyalYEIu+huYt73dtk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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