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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ee41ffe07a2e6f05eb948f41eb34e4cf292ee2d0c94ee0f8e1e153d1c47f60' 
  AND token = 'eMYfG763pChrjluVftCt04Cuadak7Ia9mhY9dh+9wsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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