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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a05185bcab20d903968b8065130fb4c719f5070a758dfd5abec07f583dfbdc' 
  AND token = '/I1iWKgl5+1t8mrOU706VeFbVHKspj3RMq4HZwx77ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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