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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735969f3accd56e30bd1674a37671be9ad9b65a5e6503b46c1a4c01f3bb75be2' 
  AND token = '8d05jg5ih7kSbuvjXGYgOQtgVopBikuqTegBJRjrmDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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