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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42423e5a5319b4b140f8d09450f9f29327da7072d3abe1d6461c1b033ce93e7e' 
  AND token = '9h3+SMyBGfMhBcZodQWb5MPfIl395xTKM/Kvg4RAdns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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