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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b05eca06f16c8129e969ed4b5101329c1062253b2ee1d98f92b577ba53dc53' 
  AND token = 'vdwYzrI9cetdt+2gvt8pLGm3OnOQzQFi2blK3zRFtJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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