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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a86987f90f3d61ce4078360b7e9f3a6a0881a84b05a3ec8dbc9f1c61c7a705' 
  AND token = 'sTQ6z5KaHVaEtDW7dwPUQ0eWGo1I5Z8PF8LnKXk6t9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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