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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f6a8128e9506e8a5b15d1b77c904c9e68ef0a3eb6dd480592f000407f2b5dc' 
  AND token = '82vp/BqTJppkDgdirmQPI5uy19/gITgDT4JLphIl1xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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