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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906002ae94d8111808baa7e45c3d27f2e42468da08a2ca683f5353d882b5a307' 
  AND token = 'ixnsAOFfbKa+wC31w2oWcP7l2MNqwtN2cRPlAe9bOIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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