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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e788588af7053c1903856d73d67aba16f9fbec91a4ee7d4a2f71ba2ce28bc40' 
  AND token = '11y0H3tWfzmXUOcAOjcbAy6Fnt4I5hU+McXCyCByYBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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