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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82484adb13653d333fd87d991f6edf8dfa5c0a6e41d6b30cdde655773e7a927' 
  AND token = 'TiEhxasWwdTh7ToaMrRdp4ZukLYpq2VHqZVpfzA7LYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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