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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1a052dfdd4aa4b9e0c18e50028b901e2e9d63b2ea04c5f1e7b36aaaa87bc71' 
  AND token = '/PiDhXG+E4vdUKpP/9L/wjbfbSiUmJuvouc94WZiYsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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